<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <!--引入CSS-->
    <link rel="stylesheet" type="text/css" href="https://cdn.staticfile.org/webuploader/0.1.5/webuploader.css">
    <!--引入JS-->

    <script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
    <script type="text/javascript" src="http://cdn.staticfile.org/webuploader/0.1.0/webuploader.min.js"></script>

</head>
<body>

<div id="uploader" class="wu-example">
    <!--用来存放文件信息-->
    <div id="thelist" class="uploader-list"></div>
    <div class="btns">
        <div id="picker">选择文件</div>
        <button id="ctlBtn" class="btn btn-default">开始上传</button>
    </div>
</div>

</body>
</html>
<script>
    // 文件上传
    jQuery(function() {
        var $ = jQuery,
            $list = $('#thelist'),
            $btn = $('#ctlBtn'),
            state = 'pending',
            // 优化retina, 在retina下这个值是2
            ratio = window.devicePixelRatio || 1,
            // 缩略图大小
            thumbnailWidth = 100 * ratio,
            thumbnailHeight = 100 * ratio,
            uploader;

        uploader = WebUploader.create({

            // 不压缩image
            resize: false,

            // swf文件路径
            swf: 'http://cdn.staticfile.org/webuploader/0.1.0/Uploader.swf',

            // 文件接收服务端。
            server: '{:url("upload")}',

            // 选择文件的按钮。可选。
            // 内部根据当前运行是创建，可能是input元素，也可能是flash.
            pick: '#picker',

            // 只允许选择文件，可选。
            accept: {
                title: 'Images',
                extensions: 'gif,jpg,jpeg,bmp,png',
                mimeTypes: 'image/*'
            }
        });

        // 当有文件添加进来的时候
        uploader.on( 'fileQueued', function( file ) {
            var $li = $(
                    '<div id="' + file.id + '" class="file-item thumbnail">' +
                    '<img>' +
                    '<div class="info">' + file.name + '</div>' +
                    '</div>'
                ),
                $img = $li.find('img');

            $list.append( $li );

            // 创建缩略图
            uploader.makeThumb( file, function( error, src ) {
                if ( error ) {
                    $img.replaceWith('<span>不能预览</span>');
                    return;
                }

                $img.attr( 'src', src );
            }, thumbnailWidth, thumbnailHeight );
        });

        // 文件上传过程中创建进度条实时显示。
        uploader.on( 'uploadProgress', function( file, percentage ) {
            var $li = $( '#'+file.id ),
                $percent = $li.find('.progress .progress-bar');

            // 避免重复创建
            if ( !$percent.length ) {
                $percent = $('<div class="progress progress-striped active">' +
                    '<div class="progress-bar" role="progressbar" style="width: 0%">' +
                    '</div>' +
                    '</div>').appendTo( $li ).find('.progress-bar');
            }

            $li.find('p.state').text('上传中');

            $percent.css( 'width', percentage * 100 + '%' );
        });

        uploader.on( 'uploadSuccess', function( file ) {
            $( '#'+file.id ).find('p.state').text('已上传');
        });

        uploader.on( 'uploadError', function( file ) {
            $( '#'+file.id ).find('p.state').text('上传出错');
        });

        uploader.on( 'uploadComplete', function( file ) {
            $( '#'+file.id ).find('.progress').fadeOut();
        });

        uploader.on( 'all', function( type ) {
            if ( type === 'startUpload' ) {
                state = 'uploading';
            } else if ( type === 'stopUpload' ) {
                state = 'paused';
            } else if ( type === 'uploadFinished' ) {
                state = 'done';
            }

            if ( state === 'uploading' ) {
                $btn.text('暂停上传');
            } else {
                $btn.text('开始上传');
            }
        });

        $btn.on( 'click', function() {
            if ( state === 'uploading' ) {
                uploader.stop();
            } else {
                uploader.upload();
            }
        });
    });

</script>